Quantum key distribution random low-density parity-check (LDPC) code parallel decoding method

A quantum key distribution, low-density parity technology, applied to key distribution, can solve the problems of low utilization efficiency, unsatisfactory, check node and variable node can not work at the same time, to improve decoding throughput and meet performance requirements Effect

Active Publication Date: 2016-02-03
NAT UNIV OF DEFENSE TECH
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Problems solved by technology

This method is simple in design, but due to the non-parallelism of the single key string check node calculation process and variable node calculation process, the check node and variable node of the LDPC decoder cannot work at the same time, the ran

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  • Quantum key distribution random low-density parity-check (LDPC) code parallel decoding method

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Embodiment Construction

[0034] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0035] Such as figure 1As shown, the quantum key distribution random type low density parity check code parallel decoding method of the present invention is a random type LDPC decoder double code parallel method applied in the subkey distribution system; its specific steps are:

[0036] S1: initialization;

[0037] This step mainly completes two tasks: 1. Load two key strings key0 and key1 from the key string storage module; 2. Complete the decoding of the variable node of key0. In this way, the decoding of key0 is performed ahead of the decoding of the variable node compared with the decoding of key1, and the decoding stage of the check node of key0 will correspond to the decoding of the variable node of key1, and then key0 and key1 can be double-coded in parallel coded.

[0038] S2: Calculate key0 verification node information an...

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Abstract

The invention discloses a quantum key distribution random low-density parity-check (LDPC) code parallel decoding method. The method comprises the following steps: S1, performing initialization: loading two key strings, namely key0 and key1, from a key string storage module, and finishing variable node decoding of the key0; S2, calculating key0 check node information and key1 variable node information; S3, performing a key0 hard decision calculation; S4, loading the key0: loading a new key string into an LDPC decoder key0 buffer area from the key string storage module; S5, calculating key1 check node information and key0 variable node information; S6, performing a key1 hard decision calculation; and S7, loading the key1: loading a new key string into a decoder key1 buffer area from the key string storage module. The method has the advantage that the overall efficiency and performance can be improved.

Description

technical field [0001] The invention mainly relates to the field of quantum key distribution systems, in particular to a parallel decoding method for random low-density parity-check codes distributed by quantum keys. Background technique [0002] With the rapid development of quantum information technology, quantum communication technology represented by quantum key distribution system is becoming more and more mature. The quantum key distribution system has absolute physical security. Its security is based on the basic principles of quantum mechanics such as the Heisenberg uncertainty principle, the quantum inaccurate cloning principle, and the quantum state measurement collapse principle, which can fundamentally ensure eavesdropping. The attacker cannot obtain communication confidential information through the attack on the quantum channel, and has broad application prospects in military, economic, financial and other information security-critical fields. [0003] The qua...

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Application Information

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IPC IPC(8): H04L9/08H04L1/00
Inventor 赵宝康虞万荣吴纯青刘波苏金树刘博尹清清
Owner NAT UNIV OF DEFENSE TECH
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